Entropy and Gibbs Free Energy

Determine whether the reaction KClO3(s) → 2KCl(s) + 3O2(g) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy increases, +ΔS

• entropy decreases, -ΔS

• entropy remains constant, ΔS = 0

• entropy decreases, +ΔS

Determine whether the reaction H2O(l) → H2O(s) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy decreases, -ΔS

• entropy increases, +ΔS

• entropy remains the same, ΔS = 0

• entropy decreases, +ΔS

Determine whether the reaction NaCl(s) → Na+(aq) + Cl-(aq) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy increases, +ΔS

• entropy decreases, -ΔS

• entropy remains constant, ΔS = 0

• entropy decreases, +ΔS

Determine whether the reaction CO2(s) → CO2(g) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy increases, +ΔS

• entropy decreases, -ΔS

• entropy remains the same, ΔS = 0

• cannot be determined

Determine whether the reaction H+(aq) + C2H3O2(aq) → HC2H3O3(l) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy decreases, -ΔS

• entropy increases, +ΔS

• entropy remains constant, ΔS = 0

• cannot be determined from the given information

Is the entropy of the reaction C(s) + O2(g) → CO2(g) increasing or decreasing?

• Entropy increases

• Entropy decreases

• Entropy remains the same

• Too close to tell

Determine whether the reaction H2(g) + Cl2(g) → 2HCl(g) shows no change in entropy.

• The reaction shows no change in entropy.

• The reaction increases entropy.

• The reaction decreases entropy.

• The reaction has variable entropy change.

Determine whether the reaction Ag+(aq) + Cl-(aq) → AgCl(s) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy decreases, -ΔS

• entropy increases, +ΔS

• entropy remains constant, ΔS = 0

• cannot be determined from the given information

Determine whether the reaction 2N2O5(g) → 4NO2(g) + O2(g) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• +ΔS

• -ΔS

• 0ΔS

• ΔS cannot be determined

Determine whether the reaction 2Al(s) + 3I2(s) → 2AlI3(s) shows an increase or decrease in entropy and write the ΔS as (+) or (-).

• entropy decreases, -ΔS

• entropy increases, +ΔS

• entropy remains constant, ΔS = 0

• cannot be determined from the given information